夜幕降临，沈诗文在灯下铺开信纸。

他要用最地道的日文写一封回信，既要表达感谢，又要保持適当的距离。每一个用词，每一个句式，都需要仔细斟酌。

次日清晨，沈诗文特意换上一件半旧的西装，这符合一个並不宽裕的留学生的身份。

他来到邮局，將昨夜写好的回信投递出去。

在填写收件地址时，他注意到邮局角落里有个戴鸭舌帽的男子正在翻看报纸，但报纸拿反了。

【內村健太：日本特务】

沈诗文不动声色地继续著手上的动作，將信封投入邮筒时，他故意让手腕上的旧錶露出来——这是他在日本读书时买的廉价手錶，錶带上还刻著“东京“二字。

这个小细节，或许能为他增添几分可信度。

走出邮局，他沿著街道缓步而行。在一家书店前驻足，他假装瀏览橱窗里的书籍，实则借著玻璃反光观察身后。

那个戴鸭舌帽的男子果然跟了出来，保持著不远不近的距离。

沈诗文心中冷笑，面上却露出欣喜的表情，推门走进书店。

他在日文书籍区停留许久，仔细挑选了一本夏目漱石的《少爷》，用日语向店员询问价格。

这个举动既自然又刻意，既展现了他对日本文学的熟悉，也强化了他的留学生身份。

付款时，他故意多问了一句：“请问有没有最近从日本寄来的文学杂誌？“店员摇头表示没有，沈诗文脸上適时地露出一丝失望。

提著新买的书，他走进一家日式茶馆。在靠窗的位置坐下，他点了一壶煎茶，將刚买的书放在桌上。茶香裊裊中，他翻开书页，神情专注。

“这位先生，可是从日本来的？“一个温和的声音在耳边响起。

沈诗文抬头，看见一位穿著和服的中年女子站在桌前。她举止优雅，髮髻梳得一丝不苟。

【山口惠子，茶馆老板，中日交流座谈会成员】

“是的，“沈诗文用日语回答，“刚出国不久。“

“看您在读夏目先生的作品，“女子微笑著坐下，“这是我最喜欢的一部小说。“

沈诗文心中警铃大作，但面上仍保持著得体的微笑：“確实是一部佳作。不知夫人是...“

“我叫山口惠子，是这家茶馆的老板。“她为沈诗文斟上一杯茶，“听口音，先生是长崎人？“

“夫人好耳力，“沈诗文抿了一口茶，“我出生在长崎。“

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他们用日语交谈著，从文学作品谈到关西的风土人情。

沈诗文对答如流，偶尔还会说几句地道的长崎方言。

这位山口夫人看似隨意的问题，实则都在试探他的底细。

谈话间，沈诗文注意到茶馆角落里坐著一位看报的客人，虽然报纸遮住了大半张脸，但那双手——指节粗大，虎口有茧，显然是常年用枪的人。

“...说起来，“山口夫人突然压低声音，“中村先生也常来我这里品茶。“

沈诗文执壶的手微微一顿，隨即自然地为她添茶：“中村先生確实是个风雅之人。“

“他前日还提起您，“山口夫人意味深长地说，“说您帮了他一个大忙。“

“举手之劳而已。“沈诗文谦逊地笑了笑。

这时，那位看报的客人起身离开。沈诗文用余光瞥见，那人在柜檯结帐时，对山口夫人微微頷首。

这场看似偶然的邂逅，显然又是一场精心安排的试探。

离开茶馆时，夕阳西斜。沈诗文走在暮色渐浓的街道上，心中思绪万千。

中村太郎的谨慎超乎他的想像，每一个环节都布下了天罗地网。

而他必须步步为营，稍有不慎就会满盘皆输。

回到住处，他锁好门窗，拉上窗帘。在昏暗的煤油灯下，他再次检查了中村太郎送来的那瓶清酒。

酒瓶在灯光下泛著温润的光泽，就像这场博弈中每个人脸上戴著的完美面具。

他取出一张信纸，开始记录今日的所见所闻。

每一个细节都被仔细描绘，每一个疑点都被重点標註。

写完后，他將信纸折成特殊的形状，藏进一本日文字典的书脊里。

窗外传来打更人的梆子声，夜已深了。

沈诗文吹熄油灯，躺在床上，却毫无睡